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# pH, Decay, Temperature Questions

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1. The critical temperature of a substance is the

a) temperature at which the vapor pressure of liquid is equal to the external pressure
b) temperature at which the vapor pressure of the liquid is equal to 760mm Hg.
c) temperature at which the solid liquid in vapor phases are in equilibrium
d) temperature at which the liquid and vapor phases are in equilibrium at 1 atmosphere
e) lowest temperature above which a substance cannot be lquified at any applied pressure

2. If the equilibrium constant for the reaction is 3.7 times 10 to the 15 which of the following correctly describes the standard voltage E degrees (using degrees to represent the true symbol), and the standard free energy change, delta G degrees, for this reaction

a) E degrees is positive and delta G degrees is negative
b) E degrees is negative and delta G degrees is positive
c) E degrees and delta G degrees are both positive
d) E degrees and delta G degrees are both negative
e) E degrees and delta G degreesor are both zero

3. When 214 decays, the emission consists consecutively of an alpha particle, then 2 beta particles, and finally another alpha. The resulting stable nucleus is?
84 Po

a) 206
83 Bi
b)210
83 Bi
c) 206
82 Bi
d) 208
82 Pb
e) 210
81 Tl

22) the pH of 0.1M ammonia is approximately

a) 1
b) 4
c) 7
d) 11
e) 14

https://brainmass.com/physics/alpha/ph-decay-temperature-questions-14989

#### Solution Preview

1. The critical temperature of a substance is the

e) lowest temperature above which a ...

#### Solution Summary

The solution provides the answers to the three multiple choice questions about pH, decay and temperature posed and also explanation as to how they were arrived at.

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